In a very large bowl, add in the balsamic vinegar, mustard, salt and pepper. Whisk to combine. Measure out the olive oil, and slowly drizzle into the vinegar mixture while whisking vigorously.
Add in all the lettuce, and toss until well coated. Divide among 4 bowls.
Top the lettuce with the cherries, apricots, avocado and almonds, and serve immediately.